Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * ipmi_watchdog.c | |
3 | * | |
4 | * A watchdog timer based upon the IPMI interface. | |
5 | * | |
6 | * Author: MontaVista Software, Inc. | |
7 | * Corey Minyard <minyard@mvista.com> | |
8 | * source@mvista.com | |
9 | * | |
10 | * Copyright 2002 MontaVista Software Inc. | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or modify it | |
13 | * under the terms of the GNU General Public License as published by the | |
14 | * Free Software Foundation; either version 2 of the License, or (at your | |
15 | * option) any later version. | |
16 | * | |
17 | * | |
18 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED | |
19 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF | |
20 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
21 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
22 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, | |
23 | * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS | |
24 | * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND | |
25 | * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR | |
26 | * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE | |
27 | * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
28 | * | |
29 | * You should have received a copy of the GNU General Public License along | |
30 | * with this program; if not, write to the Free Software Foundation, Inc., | |
31 | * 675 Mass Ave, Cambridge, MA 02139, USA. | |
32 | */ | |
33 | ||
1da177e4 LT |
34 | #include <linux/module.h> |
35 | #include <linux/moduleparam.h> | |
36 | #include <linux/ipmi.h> | |
37 | #include <linux/ipmi_smi.h> | |
609146fd | 38 | #include <linux/mutex.h> |
1da177e4 LT |
39 | #include <linux/watchdog.h> |
40 | #include <linux/miscdevice.h> | |
41 | #include <linux/init.h> | |
d6dfd131 | 42 | #include <linux/completion.h> |
1eeb66a1 | 43 | #include <linux/kdebug.h> |
1da177e4 LT |
44 | #include <linux/rwsem.h> |
45 | #include <linux/errno.h> | |
46 | #include <asm/uaccess.h> | |
47 | #include <linux/notifier.h> | |
48 | #include <linux/nmi.h> | |
49 | #include <linux/reboot.h> | |
50 | #include <linux/wait.h> | |
51 | #include <linux/poll.h> | |
cc4673ee CM |
52 | #include <linux/string.h> |
53 | #include <linux/ctype.h> | |
612b5a8d | 54 | #include <linux/delay.h> |
60063497 | 55 | #include <linux/atomic.h> |
f64da958 | 56 | |
612b5a8d | 57 | #ifdef CONFIG_X86 |
36c7dc44 CM |
58 | /* |
59 | * This is ugly, but I've determined that x86 is the only architecture | |
60 | * that can reasonably support the IPMI NMI watchdog timeout at this | |
61 | * time. If another architecture adds this capability somehow, it | |
62 | * will have to be a somewhat different mechanism and I have no idea | |
63 | * how it will work. So in the unlikely event that another | |
64 | * architecture supports this, we can figure out a good generic | |
65 | * mechanism for it at that time. | |
66 | */ | |
612b5a8d | 67 | #include <asm/kdebug.h> |
9c48f1c6 | 68 | #include <asm/nmi.h> |
612b5a8d | 69 | #define HAVE_DIE_NMI |
1da177e4 LT |
70 | #endif |
71 | ||
72 | #define PFX "IPMI Watchdog: " | |
73 | ||
1da177e4 LT |
74 | /* |
75 | * The IPMI command/response information for the watchdog timer. | |
76 | */ | |
77 | ||
78 | /* values for byte 1 of the set command, byte 2 of the get response. */ | |
79 | #define WDOG_DONT_LOG (1 << 7) | |
80 | #define WDOG_DONT_STOP_ON_SET (1 << 6) | |
81 | #define WDOG_SET_TIMER_USE(byte, use) \ | |
82 | byte = ((byte) & 0xf8) | ((use) & 0x7) | |
83 | #define WDOG_GET_TIMER_USE(byte) ((byte) & 0x7) | |
84 | #define WDOG_TIMER_USE_BIOS_FRB2 1 | |
85 | #define WDOG_TIMER_USE_BIOS_POST 2 | |
86 | #define WDOG_TIMER_USE_OS_LOAD 3 | |
87 | #define WDOG_TIMER_USE_SMS_OS 4 | |
88 | #define WDOG_TIMER_USE_OEM 5 | |
89 | ||
90 | /* values for byte 2 of the set command, byte 3 of the get response. */ | |
91 | #define WDOG_SET_PRETIMEOUT_ACT(byte, use) \ | |
92 | byte = ((byte) & 0x8f) | (((use) & 0x7) << 4) | |
93 | #define WDOG_GET_PRETIMEOUT_ACT(byte) (((byte) >> 4) & 0x7) | |
94 | #define WDOG_PRETIMEOUT_NONE 0 | |
95 | #define WDOG_PRETIMEOUT_SMI 1 | |
96 | #define WDOG_PRETIMEOUT_NMI 2 | |
97 | #define WDOG_PRETIMEOUT_MSG_INT 3 | |
98 | ||
99 | /* Operations that can be performed on a pretimout. */ | |
100 | #define WDOG_PREOP_NONE 0 | |
101 | #define WDOG_PREOP_PANIC 1 | |
36c7dc44 CM |
102 | /* Cause data to be available to read. Doesn't work in NMI mode. */ |
103 | #define WDOG_PREOP_GIVE_DATA 2 | |
1da177e4 LT |
104 | |
105 | /* Actions to perform on a full timeout. */ | |
106 | #define WDOG_SET_TIMEOUT_ACT(byte, use) \ | |
107 | byte = ((byte) & 0xf8) | ((use) & 0x7) | |
108 | #define WDOG_GET_TIMEOUT_ACT(byte) ((byte) & 0x7) | |
109 | #define WDOG_TIMEOUT_NONE 0 | |
110 | #define WDOG_TIMEOUT_RESET 1 | |
111 | #define WDOG_TIMEOUT_POWER_DOWN 2 | |
112 | #define WDOG_TIMEOUT_POWER_CYCLE 3 | |
113 | ||
36c7dc44 CM |
114 | /* |
115 | * Byte 3 of the get command, byte 4 of the get response is the | |
116 | * pre-timeout in seconds. | |
117 | */ | |
1da177e4 LT |
118 | |
119 | /* Bits for setting byte 4 of the set command, byte 5 of the get response. */ | |
120 | #define WDOG_EXPIRE_CLEAR_BIOS_FRB2 (1 << 1) | |
121 | #define WDOG_EXPIRE_CLEAR_BIOS_POST (1 << 2) | |
122 | #define WDOG_EXPIRE_CLEAR_OS_LOAD (1 << 3) | |
123 | #define WDOG_EXPIRE_CLEAR_SMS_OS (1 << 4) | |
124 | #define WDOG_EXPIRE_CLEAR_OEM (1 << 5) | |
125 | ||
36c7dc44 CM |
126 | /* |
127 | * Setting/getting the watchdog timer value. This is for bytes 5 and | |
128 | * 6 (the timeout time) of the set command, and bytes 6 and 7 (the | |
129 | * timeout time) and 8 and 9 (the current countdown value) of the | |
130 | * response. The timeout value is given in seconds (in the command it | |
131 | * is 100ms intervals). | |
132 | */ | |
1da177e4 LT |
133 | #define WDOG_SET_TIMEOUT(byte1, byte2, val) \ |
134 | (byte1) = (((val) * 10) & 0xff), (byte2) = (((val) * 10) >> 8) | |
135 | #define WDOG_GET_TIMEOUT(byte1, byte2) \ | |
136 | (((byte1) | ((byte2) << 8)) / 10) | |
137 | ||
138 | #define IPMI_WDOG_RESET_TIMER 0x22 | |
139 | #define IPMI_WDOG_SET_TIMER 0x24 | |
140 | #define IPMI_WDOG_GET_TIMER 0x25 | |
141 | ||
b75d91f7 CM |
142 | #define IPMI_WDOG_TIMER_NOT_INIT_RESP 0x80 |
143 | ||
1da177e4 LT |
144 | /* These are here until the real ones get into the watchdog.h interface. */ |
145 | #ifndef WDIOC_GETTIMEOUT | |
146 | #define WDIOC_GETTIMEOUT _IOW(WATCHDOG_IOCTL_BASE, 20, int) | |
147 | #endif | |
148 | #ifndef WDIOC_SET_PRETIMEOUT | |
149 | #define WDIOC_SET_PRETIMEOUT _IOW(WATCHDOG_IOCTL_BASE, 21, int) | |
150 | #endif | |
151 | #ifndef WDIOC_GET_PRETIMEOUT | |
152 | #define WDIOC_GET_PRETIMEOUT _IOW(WATCHDOG_IOCTL_BASE, 22, int) | |
153 | #endif | |
154 | ||
609146fd | 155 | static DEFINE_MUTEX(ipmi_watchdog_mutex); |
86a1e189 | 156 | static bool nowayout = WATCHDOG_NOWAYOUT; |
1da177e4 | 157 | |
0c8204b3 | 158 | static ipmi_user_t watchdog_user; |
b2c03941 | 159 | static int watchdog_ifnum; |
1da177e4 LT |
160 | |
161 | /* Default the timeout to 10 seconds. */ | |
162 | static int timeout = 10; | |
163 | ||
164 | /* The pre-timeout is disabled by default. */ | |
0c8204b3 | 165 | static int pretimeout; |
1da177e4 LT |
166 | |
167 | /* Default action is to reset the board on a timeout. */ | |
168 | static unsigned char action_val = WDOG_TIMEOUT_RESET; | |
169 | ||
170 | static char action[16] = "reset"; | |
171 | ||
172 | static unsigned char preaction_val = WDOG_PRETIMEOUT_NONE; | |
173 | ||
174 | static char preaction[16] = "pre_none"; | |
175 | ||
176 | static unsigned char preop_val = WDOG_PREOP_NONE; | |
177 | ||
178 | static char preop[16] = "preop_none"; | |
179 | static DEFINE_SPINLOCK(ipmi_read_lock); | |
0c8204b3 | 180 | static char data_to_read; |
1da177e4 | 181 | static DECLARE_WAIT_QUEUE_HEAD(read_q); |
0c8204b3 RD |
182 | static struct fasync_struct *fasync_q; |
183 | static char pretimeout_since_last_heartbeat; | |
1da177e4 LT |
184 | static char expect_close; |
185 | ||
b2c03941 CM |
186 | static int ifnum_to_use = -1; |
187 | ||
cc4673ee CM |
188 | /* Parameters to ipmi_set_timeout */ |
189 | #define IPMI_SET_TIMEOUT_NO_HB 0 | |
190 | #define IPMI_SET_TIMEOUT_HB_IF_NECESSARY 1 | |
191 | #define IPMI_SET_TIMEOUT_FORCE_HB 2 | |
192 | ||
193 | static int ipmi_set_timeout(int do_heartbeat); | |
b2c03941 CM |
194 | static void ipmi_register_watchdog(int ipmi_intf); |
195 | static void ipmi_unregister_watchdog(int ipmi_intf); | |
cc4673ee | 196 | |
36c7dc44 CM |
197 | /* |
198 | * If true, the driver will start running as soon as it is configured | |
199 | * and ready. | |
200 | */ | |
0c8204b3 | 201 | static int start_now; |
1da177e4 | 202 | |
c8ba6c52 | 203 | static int set_param_timeout(const char *val, const struct kernel_param *kp) |
cc4673ee CM |
204 | { |
205 | char *endp; | |
206 | int l; | |
207 | int rv = 0; | |
208 | ||
209 | if (!val) | |
210 | return -EINVAL; | |
211 | l = simple_strtoul(val, &endp, 0); | |
212 | if (endp == val) | |
213 | return -EINVAL; | |
214 | ||
cc4673ee CM |
215 | *((int *)kp->arg) = l; |
216 | if (watchdog_user) | |
217 | rv = ipmi_set_timeout(IPMI_SET_TIMEOUT_HB_IF_NECESSARY); | |
cc4673ee CM |
218 | |
219 | return rv; | |
220 | } | |
221 | ||
c8ba6c52 RR |
222 | static struct kernel_param_ops param_ops_timeout = { |
223 | .set = set_param_timeout, | |
224 | .get = param_get_int, | |
225 | }; | |
226 | #define param_check_timeout param_check_int | |
cc4673ee CM |
227 | |
228 | typedef int (*action_fn)(const char *intval, char *outval); | |
229 | ||
230 | static int action_op(const char *inval, char *outval); | |
231 | static int preaction_op(const char *inval, char *outval); | |
232 | static int preop_op(const char *inval, char *outval); | |
233 | static void check_parms(void); | |
234 | ||
c8ba6c52 | 235 | static int set_param_str(const char *val, const struct kernel_param *kp) |
cc4673ee CM |
236 | { |
237 | action_fn fn = (action_fn) kp->arg; | |
238 | int rv = 0; | |
43cdff92 SD |
239 | char valcp[16]; |
240 | char *s; | |
66f969d0 | 241 | |
43cdff92 SD |
242 | strncpy(valcp, val, 16); |
243 | valcp[15] = '\0'; | |
66f969d0 | 244 | |
43cdff92 | 245 | s = strstrip(valcp); |
cc4673ee | 246 | |
66f969d0 | 247 | rv = fn(s, NULL); |
cc4673ee | 248 | if (rv) |
f8fbcd3b | 249 | goto out; |
cc4673ee CM |
250 | |
251 | check_parms(); | |
252 | if (watchdog_user) | |
253 | rv = ipmi_set_timeout(IPMI_SET_TIMEOUT_HB_IF_NECESSARY); | |
254 | ||
f8fbcd3b | 255 | out: |
cc4673ee CM |
256 | return rv; |
257 | } | |
258 | ||
c8ba6c52 | 259 | static int get_param_str(char *buffer, const struct kernel_param *kp) |
cc4673ee CM |
260 | { |
261 | action_fn fn = (action_fn) kp->arg; | |
262 | int rv; | |
263 | ||
264 | rv = fn(NULL, buffer); | |
265 | if (rv) | |
266 | return rv; | |
267 | return strlen(buffer); | |
268 | } | |
269 | ||
b2c03941 | 270 | |
c8ba6c52 | 271 | static int set_param_wdog_ifnum(const char *val, const struct kernel_param *kp) |
b2c03941 CM |
272 | { |
273 | int rv = param_set_int(val, kp); | |
274 | if (rv) | |
275 | return rv; | |
276 | if ((ifnum_to_use < 0) || (ifnum_to_use == watchdog_ifnum)) | |
277 | return 0; | |
278 | ||
279 | ipmi_unregister_watchdog(watchdog_ifnum); | |
280 | ipmi_register_watchdog(ifnum_to_use); | |
281 | return 0; | |
282 | } | |
283 | ||
c8ba6c52 RR |
284 | static struct kernel_param_ops param_ops_wdog_ifnum = { |
285 | .set = set_param_wdog_ifnum, | |
286 | .get = param_get_int, | |
287 | }; | |
288 | ||
289 | #define param_check_wdog_ifnum param_check_int | |
290 | ||
291 | static struct kernel_param_ops param_ops_str = { | |
292 | .set = set_param_str, | |
293 | .get = get_param_str, | |
294 | }; | |
295 | ||
296 | module_param(ifnum_to_use, wdog_ifnum, 0644); | |
b2c03941 CM |
297 | MODULE_PARM_DESC(ifnum_to_use, "The interface number to use for the watchdog " |
298 | "timer. Setting to -1 defaults to the first registered " | |
299 | "interface"); | |
300 | ||
c8ba6c52 | 301 | module_param(timeout, timeout, 0644); |
1da177e4 | 302 | MODULE_PARM_DESC(timeout, "Timeout value in seconds."); |
cc4673ee | 303 | |
c8ba6c52 | 304 | module_param(pretimeout, timeout, 0644); |
1da177e4 | 305 | MODULE_PARM_DESC(pretimeout, "Pretimeout value in seconds."); |
cc4673ee | 306 | |
c8ba6c52 | 307 | module_param_cb(action, ¶m_ops_str, action_op, 0644); |
1da177e4 LT |
308 | MODULE_PARM_DESC(action, "Timeout action. One of: " |
309 | "reset, none, power_cycle, power_off."); | |
cc4673ee | 310 | |
c8ba6c52 | 311 | module_param_cb(preaction, ¶m_ops_str, preaction_op, 0644); |
1da177e4 LT |
312 | MODULE_PARM_DESC(preaction, "Pretimeout action. One of: " |
313 | "pre_none, pre_smi, pre_nmi, pre_int."); | |
cc4673ee | 314 | |
c8ba6c52 | 315 | module_param_cb(preop, ¶m_ops_str, preop_op, 0644); |
1da177e4 LT |
316 | MODULE_PARM_DESC(preop, "Pretimeout driver operation. One of: " |
317 | "preop_none, preop_panic, preop_give_data."); | |
cc4673ee | 318 | |
b2c03941 | 319 | module_param(start_now, int, 0444); |
1da177e4 LT |
320 | MODULE_PARM_DESC(start_now, "Set to 1 to start the watchdog as" |
321 | "soon as the driver is loaded."); | |
cc4673ee | 322 | |
86a1e189 | 323 | module_param(nowayout, bool, 0644); |
b2c03941 CM |
324 | MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started " |
325 | "(default=CONFIG_WATCHDOG_NOWAYOUT)"); | |
1da177e4 LT |
326 | |
327 | /* Default state of the timer. */ | |
328 | static unsigned char ipmi_watchdog_state = WDOG_TIMEOUT_NONE; | |
329 | ||
330 | /* If shutting down via IPMI, we ignore the heartbeat. */ | |
0c8204b3 | 331 | static int ipmi_ignore_heartbeat; |
1da177e4 LT |
332 | |
333 | /* Is someone using the watchdog? Only one user is allowed. */ | |
0c8204b3 | 334 | static unsigned long ipmi_wdog_open; |
1da177e4 | 335 | |
36c7dc44 CM |
336 | /* |
337 | * If set to 1, the heartbeat command will set the state to reset and | |
338 | * start the timer. The timer doesn't normally run when the driver is | |
339 | * first opened until the heartbeat is set the first time, this | |
340 | * variable is used to accomplish this. | |
341 | */ | |
0c8204b3 | 342 | static int ipmi_start_timer_on_heartbeat; |
1da177e4 LT |
343 | |
344 | /* IPMI version of the BMC. */ | |
345 | static unsigned char ipmi_version_major; | |
346 | static unsigned char ipmi_version_minor; | |
347 | ||
b385676b CM |
348 | /* If a pretimeout occurs, this is used to allow only one panic to happen. */ |
349 | static atomic_t preop_panic_excl = ATOMIC_INIT(-1); | |
1da177e4 | 350 | |
612b5a8d CM |
351 | #ifdef HAVE_DIE_NMI |
352 | static int testing_nmi; | |
353 | static int nmi_handler_registered; | |
354 | #endif | |
355 | ||
1da177e4 | 356 | static int ipmi_heartbeat(void); |
1da177e4 | 357 | |
36c7dc44 CM |
358 | /* |
359 | * We use a mutex to make sure that only one thing can send a set | |
360 | * timeout at one time, because we only have one copy of the data. | |
361 | * The mutex is claimed when the set_timeout is sent and freed | |
362 | * when both messages are free. | |
363 | */ | |
1da177e4 | 364 | static atomic_t set_timeout_tofree = ATOMIC_INIT(0); |
d6dfd131 CM |
365 | static DEFINE_MUTEX(set_timeout_lock); |
366 | static DECLARE_COMPLETION(set_timeout_wait); | |
1da177e4 LT |
367 | static void set_timeout_free_smi(struct ipmi_smi_msg *msg) |
368 | { | |
369 | if (atomic_dec_and_test(&set_timeout_tofree)) | |
d6dfd131 | 370 | complete(&set_timeout_wait); |
1da177e4 LT |
371 | } |
372 | static void set_timeout_free_recv(struct ipmi_recv_msg *msg) | |
373 | { | |
374 | if (atomic_dec_and_test(&set_timeout_tofree)) | |
d6dfd131 | 375 | complete(&set_timeout_wait); |
1da177e4 | 376 | } |
36c7dc44 | 377 | static struct ipmi_smi_msg set_timeout_smi_msg = { |
1da177e4 LT |
378 | .done = set_timeout_free_smi |
379 | }; | |
36c7dc44 | 380 | static struct ipmi_recv_msg set_timeout_recv_msg = { |
1da177e4 LT |
381 | .done = set_timeout_free_recv |
382 | }; | |
36c7dc44 | 383 | |
1da177e4 LT |
384 | static int i_ipmi_set_timeout(struct ipmi_smi_msg *smi_msg, |
385 | struct ipmi_recv_msg *recv_msg, | |
386 | int *send_heartbeat_now) | |
387 | { | |
388 | struct kernel_ipmi_msg msg; | |
389 | unsigned char data[6]; | |
390 | int rv; | |
391 | struct ipmi_system_interface_addr addr; | |
392 | int hbnow = 0; | |
393 | ||
394 | ||
612b5a8d CM |
395 | /* These can be cleared as we are setting the timeout. */ |
396 | pretimeout_since_last_heartbeat = 0; | |
397 | ||
1da177e4 LT |
398 | data[0] = 0; |
399 | WDOG_SET_TIMER_USE(data[0], WDOG_TIMER_USE_SMS_OS); | |
400 | ||
401 | if ((ipmi_version_major > 1) | |
36c7dc44 | 402 | || ((ipmi_version_major == 1) && (ipmi_version_minor >= 5))) { |
1da177e4 LT |
403 | /* This is an IPMI 1.5-only feature. */ |
404 | data[0] |= WDOG_DONT_STOP_ON_SET; | |
405 | } else if (ipmi_watchdog_state != WDOG_TIMEOUT_NONE) { | |
36c7dc44 CM |
406 | /* |
407 | * In ipmi 1.0, setting the timer stops the watchdog, we | |
408 | * need to start it back up again. | |
409 | */ | |
1da177e4 LT |
410 | hbnow = 1; |
411 | } | |
412 | ||
413 | data[1] = 0; | |
414 | WDOG_SET_TIMEOUT_ACT(data[1], ipmi_watchdog_state); | |
8f05ee9a | 415 | if ((pretimeout > 0) && (ipmi_watchdog_state != WDOG_TIMEOUT_NONE)) { |
1da177e4 LT |
416 | WDOG_SET_PRETIMEOUT_ACT(data[1], preaction_val); |
417 | data[2] = pretimeout; | |
418 | } else { | |
419 | WDOG_SET_PRETIMEOUT_ACT(data[1], WDOG_PRETIMEOUT_NONE); | |
420 | data[2] = 0; /* No pretimeout. */ | |
421 | } | |
422 | data[3] = 0; | |
423 | WDOG_SET_TIMEOUT(data[4], data[5], timeout); | |
424 | ||
425 | addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE; | |
426 | addr.channel = IPMI_BMC_CHANNEL; | |
427 | addr.lun = 0; | |
428 | ||
429 | msg.netfn = 0x06; | |
430 | msg.cmd = IPMI_WDOG_SET_TIMER; | |
431 | msg.data = data; | |
432 | msg.data_len = sizeof(data); | |
433 | rv = ipmi_request_supply_msgs(watchdog_user, | |
434 | (struct ipmi_addr *) &addr, | |
435 | 0, | |
436 | &msg, | |
437 | NULL, | |
438 | smi_msg, | |
439 | recv_msg, | |
440 | 1); | |
441 | if (rv) { | |
442 | printk(KERN_WARNING PFX "set timeout error: %d\n", | |
443 | rv); | |
444 | } | |
445 | ||
446 | if (send_heartbeat_now) | |
447 | *send_heartbeat_now = hbnow; | |
448 | ||
449 | return rv; | |
450 | } | |
451 | ||
1da177e4 LT |
452 | static int ipmi_set_timeout(int do_heartbeat) |
453 | { | |
454 | int send_heartbeat_now; | |
455 | int rv; | |
456 | ||
457 | ||
458 | /* We can only send one of these at a time. */ | |
d6dfd131 | 459 | mutex_lock(&set_timeout_lock); |
1da177e4 LT |
460 | |
461 | atomic_set(&set_timeout_tofree, 2); | |
462 | ||
463 | rv = i_ipmi_set_timeout(&set_timeout_smi_msg, | |
464 | &set_timeout_recv_msg, | |
465 | &send_heartbeat_now); | |
466 | if (rv) { | |
d6dfd131 CM |
467 | mutex_unlock(&set_timeout_lock); |
468 | goto out; | |
469 | } | |
470 | ||
471 | wait_for_completion(&set_timeout_wait); | |
472 | ||
612b5a8d CM |
473 | mutex_unlock(&set_timeout_lock); |
474 | ||
d6dfd131 CM |
475 | if ((do_heartbeat == IPMI_SET_TIMEOUT_FORCE_HB) |
476 | || ((send_heartbeat_now) | |
477 | && (do_heartbeat == IPMI_SET_TIMEOUT_HB_IF_NECESSARY))) | |
d6dfd131 | 478 | rv = ipmi_heartbeat(); |
1da177e4 | 479 | |
d6dfd131 | 480 | out: |
1da177e4 LT |
481 | return rv; |
482 | } | |
483 | ||
fcfa4724 CM |
484 | static atomic_t panic_done_count = ATOMIC_INIT(0); |
485 | ||
486 | static void panic_smi_free(struct ipmi_smi_msg *msg) | |
1da177e4 | 487 | { |
fcfa4724 | 488 | atomic_dec(&panic_done_count); |
1da177e4 | 489 | } |
fcfa4724 CM |
490 | static void panic_recv_free(struct ipmi_recv_msg *msg) |
491 | { | |
492 | atomic_dec(&panic_done_count); | |
493 | } | |
494 | ||
36c7dc44 | 495 | static struct ipmi_smi_msg panic_halt_heartbeat_smi_msg = { |
fcfa4724 CM |
496 | .done = panic_smi_free |
497 | }; | |
36c7dc44 | 498 | static struct ipmi_recv_msg panic_halt_heartbeat_recv_msg = { |
fcfa4724 CM |
499 | .done = panic_recv_free |
500 | }; | |
501 | ||
502 | static void panic_halt_ipmi_heartbeat(void) | |
503 | { | |
504 | struct kernel_ipmi_msg msg; | |
505 | struct ipmi_system_interface_addr addr; | |
506 | int rv; | |
507 | ||
36c7dc44 CM |
508 | /* |
509 | * Don't reset the timer if we have the timer turned off, that | |
510 | * re-enables the watchdog. | |
511 | */ | |
fcfa4724 CM |
512 | if (ipmi_watchdog_state == WDOG_TIMEOUT_NONE) |
513 | return; | |
514 | ||
515 | addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE; | |
516 | addr.channel = IPMI_BMC_CHANNEL; | |
517 | addr.lun = 0; | |
518 | ||
519 | msg.netfn = 0x06; | |
520 | msg.cmd = IPMI_WDOG_RESET_TIMER; | |
521 | msg.data = NULL; | |
522 | msg.data_len = 0; | |
895dcfd1 | 523 | atomic_add(2, &panic_done_count); |
fcfa4724 CM |
524 | rv = ipmi_request_supply_msgs(watchdog_user, |
525 | (struct ipmi_addr *) &addr, | |
526 | 0, | |
527 | &msg, | |
528 | NULL, | |
529 | &panic_halt_heartbeat_smi_msg, | |
530 | &panic_halt_heartbeat_recv_msg, | |
531 | 1); | |
895dcfd1 CM |
532 | if (rv) |
533 | atomic_sub(2, &panic_done_count); | |
1da177e4 | 534 | } |
fcfa4724 | 535 | |
36c7dc44 | 536 | static struct ipmi_smi_msg panic_halt_smi_msg = { |
fcfa4724 | 537 | .done = panic_smi_free |
1da177e4 | 538 | }; |
36c7dc44 | 539 | static struct ipmi_recv_msg panic_halt_recv_msg = { |
fcfa4724 | 540 | .done = panic_recv_free |
1da177e4 LT |
541 | }; |
542 | ||
36c7dc44 CM |
543 | /* |
544 | * Special call, doesn't claim any locks. This is only to be called | |
545 | * at panic or halt time, in run-to-completion mode, when the caller | |
546 | * is the only CPU and the only thing that will be going is these IPMI | |
547 | * calls. | |
548 | */ | |
1da177e4 LT |
549 | static void panic_halt_ipmi_set_timeout(void) |
550 | { | |
551 | int send_heartbeat_now; | |
552 | int rv; | |
553 | ||
fcfa4724 CM |
554 | /* Wait for the messages to be free. */ |
555 | while (atomic_read(&panic_done_count) != 0) | |
556 | ipmi_poll_interface(watchdog_user); | |
895dcfd1 | 557 | atomic_add(2, &panic_done_count); |
1da177e4 LT |
558 | rv = i_ipmi_set_timeout(&panic_halt_smi_msg, |
559 | &panic_halt_recv_msg, | |
560 | &send_heartbeat_now); | |
895dcfd1 CM |
561 | if (rv) { |
562 | atomic_sub(2, &panic_done_count); | |
fcfa4724 CM |
563 | printk(KERN_WARNING PFX |
564 | "Unable to extend the watchdog timeout."); | |
895dcfd1 CM |
565 | } else { |
566 | if (send_heartbeat_now) | |
567 | panic_halt_ipmi_heartbeat(); | |
568 | } | |
fcfa4724 CM |
569 | while (atomic_read(&panic_done_count) != 0) |
570 | ipmi_poll_interface(watchdog_user); | |
1da177e4 LT |
571 | } |
572 | ||
36c7dc44 CM |
573 | /* |
574 | * We use a mutex to make sure that only one thing can send a | |
575 | * heartbeat at one time, because we only have one copy of the data. | |
576 | * The semaphore is claimed when the set_timeout is sent and freed | |
577 | * when both messages are free. | |
578 | */ | |
1da177e4 | 579 | static atomic_t heartbeat_tofree = ATOMIC_INIT(0); |
d6dfd131 CM |
580 | static DEFINE_MUTEX(heartbeat_lock); |
581 | static DECLARE_COMPLETION(heartbeat_wait); | |
1da177e4 LT |
582 | static void heartbeat_free_smi(struct ipmi_smi_msg *msg) |
583 | { | |
584 | if (atomic_dec_and_test(&heartbeat_tofree)) | |
d6dfd131 | 585 | complete(&heartbeat_wait); |
1da177e4 LT |
586 | } |
587 | static void heartbeat_free_recv(struct ipmi_recv_msg *msg) | |
588 | { | |
589 | if (atomic_dec_and_test(&heartbeat_tofree)) | |
d6dfd131 | 590 | complete(&heartbeat_wait); |
1da177e4 | 591 | } |
36c7dc44 | 592 | static struct ipmi_smi_msg heartbeat_smi_msg = { |
1da177e4 LT |
593 | .done = heartbeat_free_smi |
594 | }; | |
36c7dc44 | 595 | static struct ipmi_recv_msg heartbeat_recv_msg = { |
1da177e4 LT |
596 | .done = heartbeat_free_recv |
597 | }; | |
36c7dc44 | 598 | |
1da177e4 LT |
599 | static int ipmi_heartbeat(void) |
600 | { | |
601 | struct kernel_ipmi_msg msg; | |
602 | int rv; | |
603 | struct ipmi_system_interface_addr addr; | |
b75d91f7 | 604 | int timeout_retries = 0; |
1da177e4 | 605 | |
612b5a8d | 606 | if (ipmi_ignore_heartbeat) |
1da177e4 | 607 | return 0; |
1da177e4 LT |
608 | |
609 | if (ipmi_start_timer_on_heartbeat) { | |
faa8b6c3 | 610 | ipmi_start_timer_on_heartbeat = 0; |
1da177e4 LT |
611 | ipmi_watchdog_state = action_val; |
612 | return ipmi_set_timeout(IPMI_SET_TIMEOUT_FORCE_HB); | |
613 | } else if (pretimeout_since_last_heartbeat) { | |
36c7dc44 CM |
614 | /* |
615 | * A pretimeout occurred, make sure we set the timeout. | |
616 | * We don't want to set the action, though, we want to | |
617 | * leave that alone (thus it can't be combined with the | |
618 | * above operation. | |
619 | */ | |
1da177e4 LT |
620 | return ipmi_set_timeout(IPMI_SET_TIMEOUT_HB_IF_NECESSARY); |
621 | } | |
622 | ||
d6dfd131 | 623 | mutex_lock(&heartbeat_lock); |
1da177e4 | 624 | |
b75d91f7 | 625 | restart: |
1da177e4 LT |
626 | atomic_set(&heartbeat_tofree, 2); |
627 | ||
36c7dc44 CM |
628 | /* |
629 | * Don't reset the timer if we have the timer turned off, that | |
630 | * re-enables the watchdog. | |
631 | */ | |
1da177e4 | 632 | if (ipmi_watchdog_state == WDOG_TIMEOUT_NONE) { |
d6dfd131 | 633 | mutex_unlock(&heartbeat_lock); |
1da177e4 LT |
634 | return 0; |
635 | } | |
636 | ||
637 | addr.addr_type = IPMI_SYSTEM_INTERFACE_ADDR_TYPE; | |
638 | addr.channel = IPMI_BMC_CHANNEL; | |
639 | addr.lun = 0; | |
640 | ||
641 | msg.netfn = 0x06; | |
642 | msg.cmd = IPMI_WDOG_RESET_TIMER; | |
643 | msg.data = NULL; | |
644 | msg.data_len = 0; | |
645 | rv = ipmi_request_supply_msgs(watchdog_user, | |
646 | (struct ipmi_addr *) &addr, | |
647 | 0, | |
648 | &msg, | |
649 | NULL, | |
650 | &heartbeat_smi_msg, | |
651 | &heartbeat_recv_msg, | |
652 | 1); | |
653 | if (rv) { | |
d6dfd131 | 654 | mutex_unlock(&heartbeat_lock); |
1da177e4 LT |
655 | printk(KERN_WARNING PFX "heartbeat failure: %d\n", |
656 | rv); | |
657 | return rv; | |
658 | } | |
659 | ||
660 | /* Wait for the heartbeat to be sent. */ | |
d6dfd131 | 661 | wait_for_completion(&heartbeat_wait); |
1da177e4 | 662 | |
b75d91f7 CM |
663 | if (heartbeat_recv_msg.msg.data[0] == IPMI_WDOG_TIMER_NOT_INIT_RESP) { |
664 | timeout_retries++; | |
665 | if (timeout_retries > 3) { | |
666 | printk(KERN_ERR PFX ": Unable to restore the IPMI" | |
667 | " watchdog's settings, giving up.\n"); | |
668 | rv = -EIO; | |
669 | goto out_unlock; | |
670 | } | |
671 | ||
672 | /* | |
673 | * The timer was not initialized, that means the BMC was | |
674 | * probably reset and lost the watchdog information. Attempt | |
675 | * to restore the timer's info. Note that we still hold | |
676 | * the heartbeat lock, to keep a heartbeat from happening | |
677 | * in this process, so must say no heartbeat to avoid a | |
678 | * deadlock on this mutex. | |
679 | */ | |
680 | rv = ipmi_set_timeout(IPMI_SET_TIMEOUT_NO_HB); | |
681 | if (rv) { | |
682 | printk(KERN_ERR PFX ": Unable to send the command to" | |
683 | " set the watchdog's settings, giving up.\n"); | |
684 | goto out_unlock; | |
685 | } | |
686 | ||
687 | /* We might need a new heartbeat, so do it now */ | |
688 | goto restart; | |
689 | } else if (heartbeat_recv_msg.msg.data[0] != 0) { | |
36c7dc44 CM |
690 | /* |
691 | * Got an error in the heartbeat response. It was already | |
692 | * reported in ipmi_wdog_msg_handler, but we should return | |
693 | * an error here. | |
694 | */ | |
695 | rv = -EINVAL; | |
1da177e4 LT |
696 | } |
697 | ||
b75d91f7 | 698 | out_unlock: |
d6dfd131 | 699 | mutex_unlock(&heartbeat_lock); |
1da177e4 LT |
700 | |
701 | return rv; | |
702 | } | |
703 | ||
36c7dc44 | 704 | static struct watchdog_info ident = { |
1da177e4 LT |
705 | .options = 0, /* WDIOF_SETTIMEOUT, */ |
706 | .firmware_version = 1, | |
707 | .identity = "IPMI" | |
708 | }; | |
709 | ||
55929332 | 710 | static int ipmi_ioctl(struct file *file, |
1da177e4 LT |
711 | unsigned int cmd, unsigned long arg) |
712 | { | |
713 | void __user *argp = (void __user *)arg; | |
714 | int i; | |
715 | int val; | |
716 | ||
36c7dc44 | 717 | switch (cmd) { |
1da177e4 LT |
718 | case WDIOC_GETSUPPORT: |
719 | i = copy_to_user(argp, &ident, sizeof(ident)); | |
720 | return i ? -EFAULT : 0; | |
721 | ||
722 | case WDIOC_SETTIMEOUT: | |
723 | i = copy_from_user(&val, argp, sizeof(int)); | |
724 | if (i) | |
725 | return -EFAULT; | |
726 | timeout = val; | |
727 | return ipmi_set_timeout(IPMI_SET_TIMEOUT_HB_IF_NECESSARY); | |
728 | ||
729 | case WDIOC_GETTIMEOUT: | |
730 | i = copy_to_user(argp, &timeout, sizeof(timeout)); | |
731 | if (i) | |
732 | return -EFAULT; | |
733 | return 0; | |
734 | ||
735 | case WDIOC_SET_PRETIMEOUT: | |
783e6bcd | 736 | case WDIOC_SETPRETIMEOUT: |
1da177e4 LT |
737 | i = copy_from_user(&val, argp, sizeof(int)); |
738 | if (i) | |
739 | return -EFAULT; | |
740 | pretimeout = val; | |
741 | return ipmi_set_timeout(IPMI_SET_TIMEOUT_HB_IF_NECESSARY); | |
742 | ||
743 | case WDIOC_GET_PRETIMEOUT: | |
783e6bcd | 744 | case WDIOC_GETPRETIMEOUT: |
1da177e4 LT |
745 | i = copy_to_user(argp, &pretimeout, sizeof(pretimeout)); |
746 | if (i) | |
747 | return -EFAULT; | |
748 | return 0; | |
749 | ||
750 | case WDIOC_KEEPALIVE: | |
751 | return ipmi_heartbeat(); | |
752 | ||
753 | case WDIOC_SETOPTIONS: | |
754 | i = copy_from_user(&val, argp, sizeof(int)); | |
755 | if (i) | |
756 | return -EFAULT; | |
36c7dc44 | 757 | if (val & WDIOS_DISABLECARD) { |
1da177e4 LT |
758 | ipmi_watchdog_state = WDOG_TIMEOUT_NONE; |
759 | ipmi_set_timeout(IPMI_SET_TIMEOUT_NO_HB); | |
760 | ipmi_start_timer_on_heartbeat = 0; | |
761 | } | |
762 | ||
36c7dc44 | 763 | if (val & WDIOS_ENABLECARD) { |
1da177e4 LT |
764 | ipmi_watchdog_state = action_val; |
765 | ipmi_set_timeout(IPMI_SET_TIMEOUT_FORCE_HB); | |
766 | } | |
767 | return 0; | |
768 | ||
769 | case WDIOC_GETSTATUS: | |
770 | val = 0; | |
771 | i = copy_to_user(argp, &val, sizeof(val)); | |
772 | if (i) | |
773 | return -EFAULT; | |
774 | return 0; | |
775 | ||
776 | default: | |
777 | return -ENOIOCTLCMD; | |
778 | } | |
779 | } | |
780 | ||
55929332 AB |
781 | static long ipmi_unlocked_ioctl(struct file *file, |
782 | unsigned int cmd, | |
783 | unsigned long arg) | |
784 | { | |
785 | int ret; | |
786 | ||
609146fd | 787 | mutex_lock(&ipmi_watchdog_mutex); |
55929332 | 788 | ret = ipmi_ioctl(file, cmd, arg); |
609146fd | 789 | mutex_unlock(&ipmi_watchdog_mutex); |
55929332 AB |
790 | |
791 | return ret; | |
792 | } | |
793 | ||
1da177e4 LT |
794 | static ssize_t ipmi_write(struct file *file, |
795 | const char __user *buf, | |
796 | size_t len, | |
797 | loff_t *ppos) | |
798 | { | |
799 | int rv; | |
800 | ||
801 | if (len) { | |
36c7dc44 CM |
802 | if (!nowayout) { |
803 | size_t i; | |
1da177e4 LT |
804 | |
805 | /* In case it was set long ago */ | |
806 | expect_close = 0; | |
807 | ||
36c7dc44 | 808 | for (i = 0; i != len; i++) { |
1da177e4 LT |
809 | char c; |
810 | ||
811 | if (get_user(c, buf + i)) | |
812 | return -EFAULT; | |
813 | if (c == 'V') | |
814 | expect_close = 42; | |
815 | } | |
816 | } | |
817 | rv = ipmi_heartbeat(); | |
818 | if (rv) | |
819 | return rv; | |
1da177e4 | 820 | } |
3976df9b | 821 | return len; |
1da177e4 LT |
822 | } |
823 | ||
824 | static ssize_t ipmi_read(struct file *file, | |
825 | char __user *buf, | |
826 | size_t count, | |
827 | loff_t *ppos) | |
828 | { | |
829 | int rv = 0; | |
830 | wait_queue_t wait; | |
831 | ||
832 | if (count <= 0) | |
833 | return 0; | |
834 | ||
36c7dc44 CM |
835 | /* |
836 | * Reading returns if the pretimeout has gone off, and it only does | |
837 | * it once per pretimeout. | |
838 | */ | |
1da177e4 LT |
839 | spin_lock(&ipmi_read_lock); |
840 | if (!data_to_read) { | |
841 | if (file->f_flags & O_NONBLOCK) { | |
842 | rv = -EAGAIN; | |
843 | goto out; | |
844 | } | |
36c7dc44 | 845 | |
1da177e4 LT |
846 | init_waitqueue_entry(&wait, current); |
847 | add_wait_queue(&read_q, &wait); | |
848 | while (!data_to_read) { | |
849 | set_current_state(TASK_INTERRUPTIBLE); | |
850 | spin_unlock(&ipmi_read_lock); | |
851 | schedule(); | |
852 | spin_lock(&ipmi_read_lock); | |
853 | } | |
854 | remove_wait_queue(&read_q, &wait); | |
36c7dc44 | 855 | |
1da177e4 LT |
856 | if (signal_pending(current)) { |
857 | rv = -ERESTARTSYS; | |
858 | goto out; | |
859 | } | |
860 | } | |
861 | data_to_read = 0; | |
862 | ||
863 | out: | |
864 | spin_unlock(&ipmi_read_lock); | |
865 | ||
866 | if (rv == 0) { | |
867 | if (copy_to_user(buf, &data_to_read, 1)) | |
868 | rv = -EFAULT; | |
869 | else | |
870 | rv = 1; | |
871 | } | |
872 | ||
873 | return rv; | |
874 | } | |
875 | ||
876 | static int ipmi_open(struct inode *ino, struct file *filep) | |
877 | { | |
36c7dc44 CM |
878 | switch (iminor(ino)) { |
879 | case WATCHDOG_MINOR: | |
e8b33617 | 880 | if (test_and_set_bit(0, &ipmi_wdog_open)) |
36c7dc44 | 881 | return -EBUSY; |
1da177e4 | 882 | |
af96f010 | 883 | |
36c7dc44 CM |
884 | /* |
885 | * Don't start the timer now, let it start on the | |
886 | * first heartbeat. | |
887 | */ | |
e8b33617 CM |
888 | ipmi_start_timer_on_heartbeat = 1; |
889 | return nonseekable_open(ino, filep); | |
1da177e4 | 890 | |
e8b33617 CM |
891 | default: |
892 | return (-ENODEV); | |
36c7dc44 | 893 | } |
1da177e4 LT |
894 | } |
895 | ||
896 | static unsigned int ipmi_poll(struct file *file, poll_table *wait) | |
897 | { | |
898 | unsigned int mask = 0; | |
36c7dc44 | 899 | |
1da177e4 LT |
900 | poll_wait(file, &read_q, wait); |
901 | ||
902 | spin_lock(&ipmi_read_lock); | |
903 | if (data_to_read) | |
904 | mask |= (POLLIN | POLLRDNORM); | |
905 | spin_unlock(&ipmi_read_lock); | |
906 | ||
907 | return mask; | |
908 | } | |
909 | ||
910 | static int ipmi_fasync(int fd, struct file *file, int on) | |
911 | { | |
912 | int result; | |
913 | ||
914 | result = fasync_helper(fd, file, on, &fasync_q); | |
915 | ||
916 | return (result); | |
917 | } | |
918 | ||
919 | static int ipmi_close(struct inode *ino, struct file *filep) | |
920 | { | |
8a3628d5 | 921 | if (iminor(ino) == WATCHDOG_MINOR) { |
1da177e4 LT |
922 | if (expect_close == 42) { |
923 | ipmi_watchdog_state = WDOG_TIMEOUT_NONE; | |
924 | ipmi_set_timeout(IPMI_SET_TIMEOUT_NO_HB); | |
1da177e4 | 925 | } else { |
8a3628d5 CM |
926 | printk(KERN_CRIT PFX |
927 | "Unexpected close, not stopping watchdog!\n"); | |
1da177e4 LT |
928 | ipmi_heartbeat(); |
929 | } | |
ec26d79f | 930 | clear_bit(0, &ipmi_wdog_open); |
1da177e4 LT |
931 | } |
932 | ||
1da177e4 LT |
933 | expect_close = 0; |
934 | ||
935 | return 0; | |
936 | } | |
937 | ||
62322d25 | 938 | static const struct file_operations ipmi_wdog_fops = { |
1da177e4 LT |
939 | .owner = THIS_MODULE, |
940 | .read = ipmi_read, | |
941 | .poll = ipmi_poll, | |
942 | .write = ipmi_write, | |
55929332 | 943 | .unlocked_ioctl = ipmi_unlocked_ioctl, |
1da177e4 LT |
944 | .open = ipmi_open, |
945 | .release = ipmi_close, | |
946 | .fasync = ipmi_fasync, | |
6038f373 | 947 | .llseek = no_llseek, |
1da177e4 LT |
948 | }; |
949 | ||
950 | static struct miscdevice ipmi_wdog_miscdev = { | |
951 | .minor = WATCHDOG_MINOR, | |
952 | .name = "watchdog", | |
953 | .fops = &ipmi_wdog_fops | |
954 | }; | |
955 | ||
1da177e4 LT |
956 | static void ipmi_wdog_msg_handler(struct ipmi_recv_msg *msg, |
957 | void *handler_data) | |
958 | { | |
b75d91f7 CM |
959 | if (msg->msg.cmd == IPMI_WDOG_RESET_TIMER && |
960 | msg->msg.data[0] == IPMI_WDOG_TIMER_NOT_INIT_RESP) | |
961 | printk(KERN_INFO PFX "response: The IPMI controller appears" | |
962 | " to have been reset, will attempt to reinitialize" | |
963 | " the watchdog timer\n"); | |
964 | else if (msg->msg.data[0] != 0) | |
1da177e4 LT |
965 | printk(KERN_ERR PFX "response: Error %x on cmd %x\n", |
966 | msg->msg.data[0], | |
967 | msg->msg.cmd); | |
36c7dc44 | 968 | |
1da177e4 LT |
969 | ipmi_free_recv_msg(msg); |
970 | } | |
971 | ||
972 | static void ipmi_wdog_pretimeout_handler(void *handler_data) | |
973 | { | |
974 | if (preaction_val != WDOG_PRETIMEOUT_NONE) { | |
b385676b CM |
975 | if (preop_val == WDOG_PREOP_PANIC) { |
976 | if (atomic_inc_and_test(&preop_panic_excl)) | |
977 | panic("Watchdog pre-timeout"); | |
978 | } else if (preop_val == WDOG_PREOP_GIVE_DATA) { | |
1da177e4 LT |
979 | spin_lock(&ipmi_read_lock); |
980 | data_to_read = 1; | |
981 | wake_up_interruptible(&read_q); | |
982 | kill_fasync(&fasync_q, SIGIO, POLL_IN); | |
983 | ||
984 | spin_unlock(&ipmi_read_lock); | |
985 | } | |
986 | } | |
987 | ||
36c7dc44 CM |
988 | /* |
989 | * On some machines, the heartbeat will give an error and not | |
990 | * work unless we re-enable the timer. So do so. | |
991 | */ | |
1da177e4 LT |
992 | pretimeout_since_last_heartbeat = 1; |
993 | } | |
994 | ||
36c7dc44 | 995 | static struct ipmi_user_hndl ipmi_hndlrs = { |
1da177e4 LT |
996 | .ipmi_recv_hndl = ipmi_wdog_msg_handler, |
997 | .ipmi_watchdog_pretimeout = ipmi_wdog_pretimeout_handler | |
998 | }; | |
999 | ||
1000 | static void ipmi_register_watchdog(int ipmi_intf) | |
1001 | { | |
1002 | int rv = -EBUSY; | |
1003 | ||
1da177e4 LT |
1004 | if (watchdog_user) |
1005 | goto out; | |
1006 | ||
b2c03941 CM |
1007 | if ((ifnum_to_use >= 0) && (ifnum_to_use != ipmi_intf)) |
1008 | goto out; | |
1009 | ||
1010 | watchdog_ifnum = ipmi_intf; | |
1011 | ||
1da177e4 LT |
1012 | rv = ipmi_create_user(ipmi_intf, &ipmi_hndlrs, NULL, &watchdog_user); |
1013 | if (rv < 0) { | |
1014 | printk(KERN_CRIT PFX "Unable to register with ipmi\n"); | |
1015 | goto out; | |
1016 | } | |
1017 | ||
1018 | ipmi_get_version(watchdog_user, | |
1019 | &ipmi_version_major, | |
1020 | &ipmi_version_minor); | |
1021 | ||
1022 | rv = misc_register(&ipmi_wdog_miscdev); | |
1023 | if (rv < 0) { | |
1024 | ipmi_destroy_user(watchdog_user); | |
1025 | watchdog_user = NULL; | |
1026 | printk(KERN_CRIT PFX "Unable to register misc device\n"); | |
1027 | } | |
1028 | ||
612b5a8d CM |
1029 | #ifdef HAVE_DIE_NMI |
1030 | if (nmi_handler_registered) { | |
1031 | int old_pretimeout = pretimeout; | |
1032 | int old_timeout = timeout; | |
1033 | int old_preop_val = preop_val; | |
1034 | ||
36c7dc44 CM |
1035 | /* |
1036 | * Set the pretimeout to go off in a second and give | |
1037 | * ourselves plenty of time to stop the timer. | |
1038 | */ | |
612b5a8d CM |
1039 | ipmi_watchdog_state = WDOG_TIMEOUT_RESET; |
1040 | preop_val = WDOG_PREOP_NONE; /* Make sure nothing happens */ | |
1041 | pretimeout = 99; | |
1042 | timeout = 100; | |
1043 | ||
1044 | testing_nmi = 1; | |
1045 | ||
1046 | rv = ipmi_set_timeout(IPMI_SET_TIMEOUT_FORCE_HB); | |
1047 | if (rv) { | |
1048 | printk(KERN_WARNING PFX "Error starting timer to" | |
1049 | " test NMI: 0x%x. The NMI pretimeout will" | |
1050 | " likely not work\n", rv); | |
1051 | rv = 0; | |
1052 | goto out_restore; | |
1053 | } | |
1054 | ||
1055 | msleep(1500); | |
1056 | ||
1057 | if (testing_nmi != 2) { | |
1058 | printk(KERN_WARNING PFX "IPMI NMI didn't seem to" | |
1059 | " occur. The NMI pretimeout will" | |
1060 | " likely not work\n"); | |
1061 | } | |
36c7dc44 | 1062 | out_restore: |
612b5a8d CM |
1063 | testing_nmi = 0; |
1064 | preop_val = old_preop_val; | |
1065 | pretimeout = old_pretimeout; | |
1066 | timeout = old_timeout; | |
1067 | } | |
1068 | #endif | |
1069 | ||
1da177e4 | 1070 | out: |
1da177e4 LT |
1071 | if ((start_now) && (rv == 0)) { |
1072 | /* Run from startup, so start the timer now. */ | |
1073 | start_now = 0; /* Disable this function after first startup. */ | |
1074 | ipmi_watchdog_state = action_val; | |
1075 | ipmi_set_timeout(IPMI_SET_TIMEOUT_FORCE_HB); | |
1076 | printk(KERN_INFO PFX "Starting now!\n"); | |
612b5a8d CM |
1077 | } else { |
1078 | /* Stop the timer now. */ | |
1079 | ipmi_watchdog_state = WDOG_TIMEOUT_NONE; | |
1080 | ipmi_set_timeout(IPMI_SET_TIMEOUT_NO_HB); | |
1da177e4 LT |
1081 | } |
1082 | } | |
1083 | ||
b2c03941 CM |
1084 | static void ipmi_unregister_watchdog(int ipmi_intf) |
1085 | { | |
1086 | int rv; | |
1087 | ||
b2c03941 CM |
1088 | if (!watchdog_user) |
1089 | goto out; | |
1090 | ||
1091 | if (watchdog_ifnum != ipmi_intf) | |
1092 | goto out; | |
1093 | ||
1094 | /* Make sure no one can call us any more. */ | |
1095 | misc_deregister(&ipmi_wdog_miscdev); | |
1096 | ||
36c7dc44 CM |
1097 | /* |
1098 | * Wait to make sure the message makes it out. The lower layer has | |
1099 | * pointers to our buffers, we want to make sure they are done before | |
1100 | * we release our memory. | |
1101 | */ | |
b2c03941 CM |
1102 | while (atomic_read(&set_timeout_tofree)) |
1103 | schedule_timeout_uninterruptible(1); | |
1104 | ||
1105 | /* Disconnect from IPMI. */ | |
1106 | rv = ipmi_destroy_user(watchdog_user); | |
1107 | if (rv) { | |
1108 | printk(KERN_WARNING PFX "error unlinking from IPMI: %d\n", | |
1109 | rv); | |
1110 | } | |
1111 | watchdog_user = NULL; | |
1112 | ||
1113 | out: | |
f8fbcd3b | 1114 | return; |
b2c03941 CM |
1115 | } |
1116 | ||
612b5a8d | 1117 | #ifdef HAVE_DIE_NMI |
1da177e4 | 1118 | static int |
9c48f1c6 | 1119 | ipmi_nmi(unsigned int val, struct pt_regs *regs) |
1da177e4 | 1120 | { |
612b5a8d CM |
1121 | /* |
1122 | * If we get here, it's an NMI that's not a memory or I/O | |
1123 | * error. We can't truly tell if it's from IPMI or not | |
1124 | * without sending a message, and sending a message is almost | |
1125 | * impossible because of locking. | |
1126 | */ | |
1127 | ||
1128 | if (testing_nmi) { | |
1129 | testing_nmi = 2; | |
9c48f1c6 | 1130 | return NMI_HANDLED; |
612b5a8d CM |
1131 | } |
1132 | ||
36c7dc44 | 1133 | /* If we are not expecting a timeout, ignore it. */ |
8f05ee9a | 1134 | if (ipmi_watchdog_state == WDOG_TIMEOUT_NONE) |
9c48f1c6 | 1135 | return NMI_DONE; |
612b5a8d CM |
1136 | |
1137 | if (preaction_val != WDOG_PRETIMEOUT_NMI) | |
9c48f1c6 | 1138 | return NMI_DONE; |
8f05ee9a | 1139 | |
36c7dc44 CM |
1140 | /* |
1141 | * If no one else handled the NMI, we assume it was the IPMI | |
1142 | * watchdog. | |
1143 | */ | |
612b5a8d | 1144 | if (preop_val == WDOG_PREOP_PANIC) { |
8f05ee9a CM |
1145 | /* On some machines, the heartbeat will give |
1146 | an error and not work unless we re-enable | |
1147 | the timer. So do so. */ | |
1148 | pretimeout_since_last_heartbeat = 1; | |
b385676b CM |
1149 | if (atomic_inc_and_test(&preop_panic_excl)) |
1150 | panic(PFX "pre-timeout"); | |
8f05ee9a | 1151 | } |
1da177e4 | 1152 | |
9c48f1c6 | 1153 | return NMI_HANDLED; |
1da177e4 | 1154 | } |
1da177e4 LT |
1155 | #endif |
1156 | ||
1157 | static int wdog_reboot_handler(struct notifier_block *this, | |
1158 | unsigned long code, | |
1159 | void *unused) | |
1160 | { | |
36c7dc44 | 1161 | static int reboot_event_handled; |
1da177e4 LT |
1162 | |
1163 | if ((watchdog_user) && (!reboot_event_handled)) { | |
1164 | /* Make sure we only do this once. */ | |
1165 | reboot_event_handled = 1; | |
1166 | ||
fcfa4724 | 1167 | if (code == SYS_POWER_OFF || code == SYS_HALT) { |
1da177e4 LT |
1168 | /* Disable the WDT if we are shutting down. */ |
1169 | ipmi_watchdog_state = WDOG_TIMEOUT_NONE; | |
423a5bb4 | 1170 | ipmi_set_timeout(IPMI_SET_TIMEOUT_NO_HB); |
96febe9f | 1171 | } else if (ipmi_watchdog_state != WDOG_TIMEOUT_NONE) { |
1da177e4 | 1172 | /* Set a long timer to let the reboot happens, but |
96febe9f CM |
1173 | reboot if it hangs, but only if the watchdog |
1174 | timer was already running. */ | |
1da177e4 LT |
1175 | timeout = 120; |
1176 | pretimeout = 0; | |
1177 | ipmi_watchdog_state = WDOG_TIMEOUT_RESET; | |
423a5bb4 | 1178 | ipmi_set_timeout(IPMI_SET_TIMEOUT_NO_HB); |
1da177e4 LT |
1179 | } |
1180 | } | |
1181 | return NOTIFY_OK; | |
1182 | } | |
1183 | ||
1184 | static struct notifier_block wdog_reboot_notifier = { | |
1185 | .notifier_call = wdog_reboot_handler, | |
1186 | .next = NULL, | |
1187 | .priority = 0 | |
1188 | }; | |
1189 | ||
1190 | static int wdog_panic_handler(struct notifier_block *this, | |
1191 | unsigned long event, | |
1192 | void *unused) | |
1193 | { | |
36c7dc44 | 1194 | static int panic_event_handled; |
1da177e4 | 1195 | |
96febe9f CM |
1196 | /* On a panic, if we have a panic timeout, make sure to extend |
1197 | the watchdog timer to a reasonable value to complete the | |
1198 | panic, if the watchdog timer is running. Plus the | |
1199 | pretimeout is meaningless at panic time. */ | |
1200 | if (watchdog_user && !panic_event_handled && | |
1201 | ipmi_watchdog_state != WDOG_TIMEOUT_NONE) { | |
1202 | /* Make sure we do this only once. */ | |
1da177e4 | 1203 | panic_event_handled = 1; |
36c7dc44 | 1204 | |
1da177e4 LT |
1205 | timeout = 255; |
1206 | pretimeout = 0; | |
1da177e4 LT |
1207 | panic_halt_ipmi_set_timeout(); |
1208 | } | |
1209 | ||
1210 | return NOTIFY_OK; | |
1211 | } | |
1212 | ||
1213 | static struct notifier_block wdog_panic_notifier = { | |
1214 | .notifier_call = wdog_panic_handler, | |
1215 | .next = NULL, | |
1216 | .priority = 150 /* priority: INT_MAX >= x >= 0 */ | |
1217 | }; | |
1218 | ||
1219 | ||
50c812b2 | 1220 | static void ipmi_new_smi(int if_num, struct device *device) |
1da177e4 LT |
1221 | { |
1222 | ipmi_register_watchdog(if_num); | |
1223 | } | |
1224 | ||
1225 | static void ipmi_smi_gone(int if_num) | |
1226 | { | |
b2c03941 | 1227 | ipmi_unregister_watchdog(if_num); |
1da177e4 LT |
1228 | } |
1229 | ||
36c7dc44 | 1230 | static struct ipmi_smi_watcher smi_watcher = { |
1da177e4 LT |
1231 | .owner = THIS_MODULE, |
1232 | .new_smi = ipmi_new_smi, | |
1233 | .smi_gone = ipmi_smi_gone | |
1234 | }; | |
1235 | ||
cc4673ee | 1236 | static int action_op(const char *inval, char *outval) |
1da177e4 | 1237 | { |
cc4673ee CM |
1238 | if (outval) |
1239 | strcpy(outval, action); | |
1240 | ||
1241 | if (!inval) | |
1242 | return 0; | |
1da177e4 | 1243 | |
cc4673ee | 1244 | if (strcmp(inval, "reset") == 0) |
1da177e4 | 1245 | action_val = WDOG_TIMEOUT_RESET; |
cc4673ee | 1246 | else if (strcmp(inval, "none") == 0) |
1da177e4 | 1247 | action_val = WDOG_TIMEOUT_NONE; |
cc4673ee | 1248 | else if (strcmp(inval, "power_cycle") == 0) |
1da177e4 | 1249 | action_val = WDOG_TIMEOUT_POWER_CYCLE; |
cc4673ee | 1250 | else if (strcmp(inval, "power_off") == 0) |
1da177e4 | 1251 | action_val = WDOG_TIMEOUT_POWER_DOWN; |
cc4673ee CM |
1252 | else |
1253 | return -EINVAL; | |
1254 | strcpy(action, inval); | |
1255 | return 0; | |
1256 | } | |
1257 | ||
1258 | static int preaction_op(const char *inval, char *outval) | |
1259 | { | |
1260 | if (outval) | |
1261 | strcpy(outval, preaction); | |
1da177e4 | 1262 | |
cc4673ee CM |
1263 | if (!inval) |
1264 | return 0; | |
1265 | ||
1266 | if (strcmp(inval, "pre_none") == 0) | |
1da177e4 | 1267 | preaction_val = WDOG_PRETIMEOUT_NONE; |
cc4673ee | 1268 | else if (strcmp(inval, "pre_smi") == 0) |
1da177e4 | 1269 | preaction_val = WDOG_PRETIMEOUT_SMI; |
612b5a8d | 1270 | #ifdef HAVE_DIE_NMI |
cc4673ee | 1271 | else if (strcmp(inval, "pre_nmi") == 0) |
1da177e4 LT |
1272 | preaction_val = WDOG_PRETIMEOUT_NMI; |
1273 | #endif | |
cc4673ee | 1274 | else if (strcmp(inval, "pre_int") == 0) |
1da177e4 | 1275 | preaction_val = WDOG_PRETIMEOUT_MSG_INT; |
cc4673ee CM |
1276 | else |
1277 | return -EINVAL; | |
1278 | strcpy(preaction, inval); | |
1279 | return 0; | |
1280 | } | |
1281 | ||
1282 | static int preop_op(const char *inval, char *outval) | |
1283 | { | |
1284 | if (outval) | |
1285 | strcpy(outval, preop); | |
1da177e4 | 1286 | |
cc4673ee CM |
1287 | if (!inval) |
1288 | return 0; | |
1289 | ||
1290 | if (strcmp(inval, "preop_none") == 0) | |
1da177e4 | 1291 | preop_val = WDOG_PREOP_NONE; |
cc4673ee | 1292 | else if (strcmp(inval, "preop_panic") == 0) |
1da177e4 | 1293 | preop_val = WDOG_PREOP_PANIC; |
cc4673ee | 1294 | else if (strcmp(inval, "preop_give_data") == 0) |
1da177e4 | 1295 | preop_val = WDOG_PREOP_GIVE_DATA; |
cc4673ee CM |
1296 | else |
1297 | return -EINVAL; | |
1298 | strcpy(preop, inval); | |
1299 | return 0; | |
1300 | } | |
1da177e4 | 1301 | |
cc4673ee CM |
1302 | static void check_parms(void) |
1303 | { | |
612b5a8d | 1304 | #ifdef HAVE_DIE_NMI |
cc4673ee CM |
1305 | int do_nmi = 0; |
1306 | int rv; | |
1307 | ||
1da177e4 | 1308 | if (preaction_val == WDOG_PRETIMEOUT_NMI) { |
cc4673ee | 1309 | do_nmi = 1; |
1da177e4 LT |
1310 | if (preop_val == WDOG_PREOP_GIVE_DATA) { |
1311 | printk(KERN_WARNING PFX "Pretimeout op is to give data" | |
1312 | " but NMI pretimeout is enabled, setting" | |
1313 | " pretimeout op to none\n"); | |
cc4673ee CM |
1314 | preop_op("preop_none", NULL); |
1315 | do_nmi = 0; | |
1da177e4 | 1316 | } |
cc4673ee CM |
1317 | } |
1318 | if (do_nmi && !nmi_handler_registered) { | |
9c48f1c6 DZ |
1319 | rv = register_nmi_handler(NMI_UNKNOWN, ipmi_nmi, 0, |
1320 | "ipmi"); | |
1da177e4 | 1321 | if (rv) { |
cc4673ee CM |
1322 | printk(KERN_WARNING PFX |
1323 | "Can't register nmi handler\n"); | |
1324 | return; | |
1325 | } else | |
1326 | nmi_handler_registered = 1; | |
1327 | } else if (!do_nmi && nmi_handler_registered) { | |
9c48f1c6 | 1328 | unregister_nmi_handler(NMI_UNKNOWN, "ipmi"); |
cc4673ee | 1329 | nmi_handler_registered = 0; |
1da177e4 LT |
1330 | } |
1331 | #endif | |
cc4673ee CM |
1332 | } |
1333 | ||
1334 | static int __init ipmi_wdog_init(void) | |
1335 | { | |
1336 | int rv; | |
1337 | ||
1338 | if (action_op(action, NULL)) { | |
1339 | action_op("reset", NULL); | |
1340 | printk(KERN_INFO PFX "Unknown action '%s', defaulting to" | |
1341 | " reset\n", action); | |
1342 | } | |
1343 | ||
1344 | if (preaction_op(preaction, NULL)) { | |
1345 | preaction_op("pre_none", NULL); | |
1346 | printk(KERN_INFO PFX "Unknown preaction '%s', defaulting to" | |
1347 | " none\n", preaction); | |
1348 | } | |
1349 | ||
1350 | if (preop_op(preop, NULL)) { | |
1351 | preop_op("preop_none", NULL); | |
1352 | printk(KERN_INFO PFX "Unknown preop '%s', defaulting to" | |
1353 | " none\n", preop); | |
1354 | } | |
1355 | ||
1356 | check_parms(); | |
1da177e4 | 1357 | |
b2c03941 CM |
1358 | register_reboot_notifier(&wdog_reboot_notifier); |
1359 | atomic_notifier_chain_register(&panic_notifier_list, | |
1360 | &wdog_panic_notifier); | |
1361 | ||
1da177e4 LT |
1362 | rv = ipmi_smi_watcher_register(&smi_watcher); |
1363 | if (rv) { | |
612b5a8d CM |
1364 | #ifdef HAVE_DIE_NMI |
1365 | if (nmi_handler_registered) | |
9c48f1c6 | 1366 | unregister_nmi_handler(NMI_UNKNOWN, "ipmi"); |
1da177e4 | 1367 | #endif |
b2c03941 CM |
1368 | atomic_notifier_chain_unregister(&panic_notifier_list, |
1369 | &wdog_panic_notifier); | |
1370 | unregister_reboot_notifier(&wdog_reboot_notifier); | |
1da177e4 LT |
1371 | printk(KERN_WARNING PFX "can't register smi watcher\n"); |
1372 | return rv; | |
1373 | } | |
1374 | ||
1fdd75bd CM |
1375 | printk(KERN_INFO PFX "driver initialized\n"); |
1376 | ||
1da177e4 LT |
1377 | return 0; |
1378 | } | |
1379 | ||
b2c03941 | 1380 | static void __exit ipmi_wdog_exit(void) |
1da177e4 | 1381 | { |
b2c03941 CM |
1382 | ipmi_smi_watcher_unregister(&smi_watcher); |
1383 | ipmi_unregister_watchdog(watchdog_ifnum); | |
1da177e4 | 1384 | |
612b5a8d | 1385 | #ifdef HAVE_DIE_NMI |
cc4673ee | 1386 | if (nmi_handler_registered) |
9c48f1c6 | 1387 | unregister_nmi_handler(NMI_UNKNOWN, "ipmi"); |
1da177e4 LT |
1388 | #endif |
1389 | ||
e041c683 | 1390 | atomic_notifier_chain_unregister(&panic_notifier_list, |
b2c03941 | 1391 | &wdog_panic_notifier); |
1da177e4 | 1392 | unregister_reboot_notifier(&wdog_reboot_notifier); |
1da177e4 LT |
1393 | } |
1394 | module_exit(ipmi_wdog_exit); | |
1395 | module_init(ipmi_wdog_init); | |
1396 | MODULE_LICENSE("GPL"); | |
1fdd75bd CM |
1397 | MODULE_AUTHOR("Corey Minyard <minyard@mvista.com>"); |
1398 | MODULE_DESCRIPTION("watchdog timer based upon the IPMI interface."); |